Shawn W

I am in the process of rebuilding my LT1. I bought a rebuild kit from summit that came with a high volume oil pump. Should i use this one or just a melling standard volume pump.

thanks
Shawn

Zjoker

No
Not unless you are doing serious mod to the engine. Often times high volume pumps tend to put a load on the engine (-hp) with no real gains ::

Shawn W

Well i am doing

Eagle Esp Crank
Scat 4340 Rods
Speed Pro Forged pistons
Stock Heads
CC 305 Cam
Crane Gold Rockers
Crane valve springs

I will be spraying a 175 shot.

thanks
Shawn

Josh-'04 GTO

The answer is still no...especially with the stock oil pan.

CANTONRACER

More importantly is the main bearing with an aftermarket crank. Is it a cross drilled crank?

NOMAD

I've had a HV Melling pump on my car with a stock pan for about a year now with no problems and I honestly don't see how this can even be bad for a forged botom end.

-Shannon

treyZ28

answer is still no shannon, but welcome back anyway

qwick_trip

just wondering? if he did put the high volume pump on there would it do anything bad or hurt it at all?

Xscream

One of the biggest problem LT1 drivers have is the fact that the GM pan sucks. A stock volume oil pump can be made to cavitate with out much difficutly. By putting in a HV pump you significatly increase the risk of this happening.

Fastfoward to the fact your car is modified, now you will have a even greater risk of sucking air than oil - and trust me, bearings prefer oil. I honestly wouldn't build a motor without a Canton or similar pan. Its the best insurance you can put on your motor. The factory pan has no baffles and the pickup is to far up in the pan for a performance motor IMO - just a bad design. With a canton or other aftermarket pan they should have baffles and traps usually with a lot better windage tray as well.

Mr. Z28 73/97

The only time you would have to worry about the stock pan being sucked dry is if you are running your car at high rpm for extended periods of time such as if you are road racing your car. In normal driving and drag racing etc you're not at sustained high rpm. A hv pump just pushes more oil thru the engine so for me I prefer to have the additional volume for the bearings than not. Just my opinion.

Gripenfelter

I had a chat with Nick from Nu-Tek Motorsports about this. I have a HV pump on my stock oil pan.

He's running several cars with the stock pan and a HV pump with no problems also.

So its a matter of opinion and how the engine is assembled.

Josh-'04 GTO

Ask Chad from Holley what happens when you run a HV pump with stock pan....

High rpm with HV pump sucks stock pan down in no time. No oil=dry bearings=afternoon revisting the fine art of motor rebuilding.

FastZinTennessee

Well that sucks........... I was gonna put a HV oil pump on my car when I did the heads and cam. I have this weird problem where on second gear pulls the oil pressure will drop down as much as 25psi, stay for a second then come up to normal again.

I really don't want to get an aftermarket oil pan, I don't have the money.

What about a HV oil pump, running a bigger filter and overfilling the oil pan some??

John

Josh-'04 GTO

Well, when you're not at high rpm the oil will now be smothering the crank pretty much all the time, which introduces parasitic drag and increases oil temp.

Shawn 97 Z28 M6

I ran a melling high volume / high pressure pump in my car - until I managed to shear the teeth off the oil pump drive gear.

Now I'm running a moroso anti cav "racing" oil pump w/ a high pressure spring and have had absolutely no problems. On a side note - my car doesn't use as much oil now as it used to... wierd